X-Git-Url: https://git.kernelconcepts.de/?p=metawatch.git;a=blobdiff_plain;f=metawatch.c;h=e487e354f2cbb4703c2bf2eac956aa11b6e26a42;hp=7305b033e9ab1f3e7b40c2a988810037b8f75d14;hb=c0807b3785b36e8b31b42964cd8fe02d9c43a435;hpb=5c3d6461a1e52a6741efe989f8f1170edd6111a5;ds=sidebyside

diff --git a/metawatch.c b/metawatch.c
index 7305b03..e487e35 100644
--- a/metawatch.c
+++ b/metawatch.c
@@ -1,29 +1,797 @@
 /*
- * (c) 2011 Siegen, Germany by Nils Faerber
+ * (c) 2011 Siegen, Germany by Nils Faerber <nils.faerber@kernelconcepts.de>
  *
- * license GPL
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
  */
+
 #include <stdio.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <fcntl.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <termios.h>
+#include <ctype.h>
 
+#include "metawatch.h"
 #include "metawatch_protocol.h"
+#include "crc16ccitt.h"
 
-int main(int argc, char **argv)
-{
-  int mwfd;
 
-  if (argc != 2) {
-    fprintf(stderr, "Usage:\n\t%s <devicename>\n", argv[0]);
-    return 1;
-  };
-  
-  mwfd = open(argv[1], O_RDWR);
-  if (mwfd < 0) {
-    perror("open");
-    return 1;
-  };
+#ifdef DEBUG
+const char *mw_screen_mode_names[] = {
+	"idle screen",
+	"application screen",
+	"notification screen",
+	"scroll"
+};
 
-  return 0;
+const char *mw_status_string[] = {
+	"Reserved",
+	"Mode Change",
+	"Display Timeout"
 };
+#endif
+
+
+#define MW_FRAME_DELAY		0x00
+
+/* ----------------------------------------------------------------------
+ * Debugging helpers
+ * ---------------------------------------------------------------------- */
+
+void dump_frame(unsigned char *frame, int len)
+{
+	int i;
+
+	for (i=0; i<len; i++)
+		fprintf(stderr, "0x%02x ", frame[i]);
+	fprintf(stderr, "\n");
+}
+
+
+int mw_send_frame(mwdevice_t *mwdevice, unsigned char msg_type, unsigned char options, unsigned char *data, unsigned char len)
+{
+	unsigned short crc;
+	unsigned char frame[64];
+	int tlen = len + 6; /* payload + 6 bytes frameing */
+	int ret;
+
+	memset(frame, 0, 64);
+	frame[0] = MW_SOF;
+	frame[1] = len + 6;
+	frame[2] = msg_type;
+	frame[3] = options;
+	if (data != NULL && len > 0)
+		memcpy(frame+4, data, len);
+
+	crc = crc16ccitt(frame, len+4);
+	*(unsigned short *)(frame+len+4) = crc;
+
+#ifdef DEBUG
+	dump_frame(frame, tlen);
+#endif
+
+	while (((ret = write(mwdevice->mw_fd, frame, tlen)) >= 0) && (tlen > 0))
+		tlen -= ret;
+
+	if (MW_FRAME_DELAY)
+		usleep(MW_FRAME_DELAY);
+
+	if (tlen == 0 && ret >= 0)
+		return 0;
+	else
+		return ret;
+}
+
+
+/* ----------------------------------------------------------------------
+ * Host to watch commands
+ * ---------------------------------------------------------------------- */
+
+
+int mw_set_rtc(mwdevice_t *mwdevice, struct tm *mw_tm)
+{
+	unsigned short year;
+	unsigned char data[32];
+
+	year = mw_tm->tm_year + 1900;  
+	data[0] = (year & 0x0f00) >> 8;
+	data[1] = (year & 0x00ff);
+	data[2] = mw_tm->tm_mon + 1;
+	data[3] = mw_tm->tm_mday;
+	data[4] = mw_tm->tm_wday;
+	data[5] = mw_tm->tm_hour;
+	data[6] = mw_tm->tm_min;
+	data[7] = mw_tm->tm_sec;
+
+	return mw_send_frame(mwdevice, MW_SET_REAL_TIME_CLOCK, 0, data, 8);
+}
+
+int mw_nval_operation(mwdevice_t *mwdevice, unsigned char operation, unsigned short identifier, unsigned char size, void *mdata)
+{
+	unsigned char data[32];
+
+	data[0] = (identifier & 0x00ff);
+	data[1] = (identifier & 0xff00) >> 8;
+	data[2] = size;
+	if (size > 0 && mdata != NULL)
+		memcpy((data+3), mdata, size);
+
+	if (operation == MW_NVAL_OPERATION_READ || operation == MW_NVAL_OPERATION_WRITE) {
+		return mw_send_frame(mwdevice, MW_NVAL_OPERATION, operation, data, 3+size);
+	} else
+		return -1;
+}
+
+int mw_set_vibrate_mode(mwdevice_t *mwdevice, unsigned char enable, unsigned short on_time, unsigned short off_time, unsigned char cycles)
+{
+	unsigned char mdata[7];
+
+	mdata[0] = enable;
+	*(unsigned short *)(mdata+1) = on_time; /* miliseconds */
+	*(unsigned short *)(mdata+3) = off_time; /* miliseconds */
+	mdata[5] = cycles;
+
+	return mw_send_frame(mwdevice, MW_SET_VIBRATE_MODE, 0, mdata, 6);
+}
+
+int mw_configure_watch_mode(mwdevice_t *mwdevice, unsigned char mode, unsigned char save, unsigned char timeout, unsigned char invert)
+{
+	unsigned char mdata[3];
+
+	mdata[0] = timeout; /* seconds */
+	mdata[1] = invert; /* 0=normal, 1=invert */
+
+	return mw_send_frame(mwdevice, MW_CONFIGURE_MODE, (mode & 0x0f) | ((save & 0x01) << 4), mdata, 2);
+}
+
+int mw_update_display(mwdevice_t *mwdevice, unsigned char mode, unsigned char copy)
+{
+	mwdevice->screen_mode = (mode & 0x0f);
+	return mw_send_frame(mwdevice, MW_UPDATE_DISPLAY, (mode & 0x0f) | ((copy & 0x01) << 4), NULL, 0);
+}
+
+int mw_load_template(mwdevice_t *mwdevice, unsigned char mode, unsigned char template_select)
+{
+	return mw_send_frame(mwdevice, MW_LOAD_TEMPLATE, (mode & 0x0f), &template_select, 1);
+}
+
+/*
+ * send line for screen-mode mode from *buffer to watch, starting at display row row_offset
+ * this is only for digital LCD watch
+ */
+int mw_write_buffer(mwdevice_t *mwdevice,
+		unsigned char mode,
+		unsigned char numlines,		/* number of lines, 0=two lines or 1=one line */
+		unsigned char row_offset,	/* start at row_offset in display, e.g. lower part in idle @31 */
+		unsigned char *buffer, int buflen)
+{
+	unsigned char mdata[32];
+
+	if (mwdevice->devtype != MW_DEVICE_TYPE_DIGITAL && mwdevice->devtype != MW_DEVICE_TYPE_DEVB_DIGI)
+		return -1;
+
+	buflen = 12 * (buflen / 12);	/* crop to 12 bytes */
+	if ((numlines == 0 && buflen < 12) || (numlines == 1 && buflen < 24)) {
+		fprintf(stderr, "mw_write_buffer: bufferlen does not match number of lines\n");
+		return -1;
+	};
+	memset(mdata, 0, 32);
+	mdata[0] = row_offset;
+	memcpy((mdata+1), buffer, 12);
+	if (numlines == 0) {
+		mdata[13] = row_offset+1;
+		memcpy((mdata+14), (buffer+12), 12);
+	};
+
+	return mw_send_frame(mwdevice, MW_WRITE_BUFFER, (mode & 0x0f) | (((numlines & 0x01)<< 4) & 0x10), mdata, numlines ? 13 : 26);
+}
+
+/*
+   Options:
+	B0   : row select, 0 first row, 1 second row
+	B1   : display select, 0 upper OLED, 1 lower OLED
+	B2   : if 1 send an event upon completion
+	B3..4: scroll type,
+	B5..7: unused
+   Scroll types:
+   	B0: First buffer in a chain of scroll buffers
+   	B1: Any buffer except first or last
+   	B2: Last buffer of a chain
+   	B3: reserved / unused
+   Payload:
+   	0: Start index col
+   	1..: data
+*/
+int mw_write_oled_buffer(mwdevice_t *mwdevice,
+	unsigned char mode, /* idle or scroll */
+	unsigned char oled, /* which OLED */
+	unsigned char numcols,
+	unsigned char col_index, /* starting index */
+	unsigned char *buffer, int buflen)
+{
+	unsigned char mdata[32];
+	int i;
+
+	if (mwdevice->devtype != MW_DEVICE_TYPE_ANA_DIGI && mwdevice->devtype != MW_DEVICE_TYPE_DEVB_ANA_DIGI)
+		return -1;
+	
+	fprintf(stderr, "write oled buf len = %d\n", buflen);
+	/* lower row first since display wil be updated after completion of upper row */
+	if (buflen > 80) {
+		for (i=80; i<buflen; i+=20) {
+			mdata[0] = (i-80);
+			memcpy((mdata+1), (buffer+i), 20);
+			mw_send_frame(mwdevice, MW_WRITE_OLED_IDLE_DISPLAY_MSG, 0 | (oled ? 2 : 0), mdata, 21);
+		}
+	}
+	for (i=0; i<80; i+=20) {
+		mdata[0] = i;
+		memcpy((mdata+1), (buffer+i), 20);
+		mw_send_frame(mwdevice, MW_WRITE_OLED_IDLE_DISPLAY_MSG, 1 | (oled ? 2 : 0), mdata, 21);
+	}
+
+	return 0;
+}
+
+int mw_enable_button(mwdevice_t *mwdevice,
+		unsigned char mode,
+		unsigned char button_index,
+		unsigned char press_type,
+		unsigned char callback_type,
+		unsigned char callback_option)
+{
+	unsigned char mdata[32];
+
+	memset(mdata, 0, 32);
+	mdata[0] = mode;
+	mdata[1] = button_index;
+	mdata[2] = press_type;
+	mdata[3] = callback_type;
+	mdata[4] = callback_option;
+
+	return mw_send_frame(mwdevice, MW_ENABLE_BUTTON, 0, mdata, 5);
+}
+
+int mw_disable_button(mwdevice_t *mwdevice,
+		unsigned char mode,
+		unsigned char button_index,
+		unsigned char press_type)
+{
+	unsigned char mdata[32];
+
+	memset(mdata, 0, 32);
+	mdata[0] = mode;
+	mdata[1] = button_index;
+	mdata[2] = press_type;
+
+	return mw_send_frame(mwdevice, MW_ENABLE_BUTTON, 0, mdata, 3);
+}
+
+int mw_advance_watch_hands(mwdevice_t *mwdevice, unsigned char hours, unsigned char minutes, unsigned char seconds)
+{
+	unsigned char mdata[4];
+	
+	if (hours > 12)
+		return -1;
+	if (minutes > 60)
+		return -1;
+	if (seconds > 60)
+		return -1;
+
+	mdata[0] = hours;
+	mdata[1] = minutes;
+	mdata[2] = seconds;
+
+	return mw_send_frame(mwdevice, MW_ADVANCE_WATCH_HANDS, 0, mdata, 3);
+}
+
+int mw_battery_configuration(mwdevice_t *mwdevice, unsigned char warn_lvl, unsigned char bt_off_lvl)
+{
+	unsigned char mdata[4];
+	
+	if (warn_lvl < 28 || warn_lvl > 42)
+		return -1;
+	if (bt_off_lvl < 28 || bt_off_lvl > 42)
+		return -1;
+
+	mdata[0] = warn_lvl;
+	mdata[1] = bt_off_lvl;
+
+	return mw_send_frame(mwdevice, MW_BATTERY_CONFIG_MSG, 0, mdata, 2);
+}
+
+
+/* ----------------------------------------------------------------------
+ * Watch responses, events or notifications
+ * ---------------------------------------------------------------------- */
+
+int mw_get_device_type_response(mwdevice_t *mwdevice, unsigned char devtype)
+{
+#ifdef DEBUG
+	fprintf(stderr, "Got device type ");
+	switch(devtype) {
+		case 0:
+			fprintf(stderr, "Reserved\n");
+			break;
+		case 1:
+			fprintf(stderr, "Ana-Digi\n");
+			break;
+		case 2:
+			fprintf(stderr, "Digital\n");
+			break;
+		case 3:
+			fprintf(stderr, "Development Board Digital\n");
+			break;
+		case 4:
+			fprintf(stderr, "Development Board Ana-Digi\n");
+			break;
+		default:
+			fprintf(stderr, "unknown %d\n", devtype);
+			break;
+	};
+#endif
+	mwdevice->devtype = devtype;
+	if (mwdevice->mw_get_device_type_response_cb != NULL)
+		mwdevice->mw_get_device_type_response_cb(mwdevice, devtype, mwdevice->mw_gdtypersp_data);
+	return 0;
+}
+
+void mw_set_get_device_type_response_cb(mwdevice_t *mwdevice, void (*mw_get_device_type_response_cb) (mwdevice_t *mwdevice, unsigned char devtype, void *user_data), void *user_data)
+{
+	if (mw_get_device_type_response_cb != NULL)
+		mwdevice->mw_get_device_type_response_cb = mw_get_device_type_response_cb;
+	if (user_data != NULL)
+		mwdevice->mw_gdtypersp_data = user_data;
+}
+
+int mw_nval_operation_response(mwdevice_t *mwdevice, unsigned char operation, unsigned short identifier, unsigned char size, void *mdata)
+{
+	return -1;
+}
+
+int mw_get_real_time_clock_response(mwdevice_t *mwdevice, unsigned char *rtcrsp, int len)
+{
+	struct tm mtm;
+	unsigned short year;
+
+	if (len != 8) {
+		fprintf(stderr, "get real time clock response length wrong %d != 10\n", len);
+		return -1;
+	}
+
+	year = *(unsigned short *)rtcrsp;
+	mtm.tm_year = year - 1900;
+	mtm.tm_mon = rtcrsp[2] - 1;
+	mtm.tm_mday = rtcrsp[3];
+	mtm.tm_wday = rtcrsp[4];
+	mtm.tm_hour = rtcrsp[5];
+	mtm.tm_min = rtcrsp[6];
+	mtm.tm_sec = rtcrsp[7];
+
+#ifdef DEBUG
+	fprintf(stderr, "watch RTC is %s\n", asctime(&mtm));
+#endif
+	if (mwdevice->mw_get_real_time_clock_response_cb != NULL)
+		mwdevice->mw_get_real_time_clock_response_cb(mwdevice, &mtm, mwdevice->mw_grtcrsp_data);
+
+	return 0;
+}
+
+void mw_set_get_real_time_clock_response_cb(mwdevice_t *mwdevice, void (*mw_get_real_time_clock_response_cb) (mwdevice_t *mwdevice, struct tm *mw_tm, void *user_data), void *user_data)
+{
+	if (mw_get_real_time_clock_response_cb != NULL)
+		mwdevice->mw_get_real_time_clock_response_cb = mw_get_real_time_clock_response_cb;
+	if (user_data != NULL)
+		mwdevice->mw_grtcrsp_data = user_data;
+}
+
+
+int mw_get_battery_voltage_response(mwdevice_t *mwdevice, unsigned char *batrsp, int len)
+{
+	unsigned char power_good = batrsp[0];
+	unsigned char bat_charging = batrsp[1];
+	unsigned short voltage = *(unsigned short *)(batrsp+2);
+	unsigned short voltage_avg = *(unsigned short *)(batrsp+4);
+
+#ifdef DEBUG
+	fprintf(stderr, "battery is at %dmV (average is %dmV), %s and %s\n", voltage, voltage_avg, power_good ? "power is good" : "power fault", bat_charging ? "charging" : "not charging");
+#endif
+
+	if (mwdevice->mw_get_battery_voltage_response_cb != NULL)
+		mwdevice->mw_get_battery_voltage_response_cb(mwdevice, &voltage, &voltage_avg, &power_good, &bat_charging, mwdevice->mw_gbatvrsp_data);
+
+	return 0;
+}
+
+void mw_set_get_battery_voltage_response_cb(mwdevice_t *mwdevice, void (*mw_get_battery_voltage_response_cb) (mwdevice_t *mwdevice, unsigned short *voltage, unsigned short *voltage_avg, unsigned char *pgood, unsigned char *charging, void *user_data), void *user_data)
+{
+	if (mw_get_battery_voltage_response_cb != NULL)
+		mwdevice->mw_get_battery_voltage_response_cb = mw_get_battery_voltage_response_cb;
+	if (user_data != NULL)
+		mwdevice->mw_gbatvrsp_data = user_data;
+}
+
+#if 0
+int mw_read_button_config_response(mwdevice_t *mwdevice, unsigned char *btnrsp, int len)
+{
+#ifdef DEBUG
+	fprintf(stderr, "read button config response\n");
+	fprintf(stderr, "screen mode      : 0x%02x\n", btnrsp[0]);
+	fprintf(stderr, "button index     : 0x%02x\n", btnrsp[1]);
+	fprintf(stderr, "mask table       : 0x%02x (", btnrsp[2]);
+	fprintf(stderr, "%s ", (btnrsp[2] & 0x01) ? "Absolute, " : "");
+	fprintf(stderr, "%s ", (btnrsp[2] & 0x02) ? "Press&Release, " : "");
+	fprintf(stderr, "%s ", (btnrsp[2] & 0x04) ? "Press&Hold, " : "");
+	fprintf(stderr, "%s ", (btnrsp[2] & 0x08) ? "Press&LongHold, " : "");
+	fprintf(stderr, "%s ", (btnrsp[2] & 0x10) ? "Immediate" : "");
+	fprintf(stderr, ")\n");
+	fprintf(stderr, "callback msg type: 0x%02x\n", btnrsp[3]);
+	fprintf(stderr, "callback msg opts: 0x%02d\n", btnrsp[4]);
+#endif
+
+	return 0;
+}
+#endif
+
+void mw_set_read_button_config_response_cb(mwdevice_t *mwdevice, void (*mw_read_button_config_response_cb) (mwdevice_t *mwdevice, void *user_data), void *user_data)
+{
+	if (mw_read_button_config_response_cb != NULL)
+		mwdevice->mw_read_button_config_response_cb = mw_read_button_config_response_cb;
+	if (user_data != NULL)
+		mwdevice->mw_rbtncnfrsp_data = user_data;
+}
+
+int mw_button_event_message(mwdevice_t *mwdevice, unsigned char *btnevt, int len, unsigned char opts)
+{
+#ifdef DEBUG
+	fprintf(stderr, "Button event message, button %d options %d\n", btnevt[0], opts);
+#endif
+
+	if (mwdevice->mw_button_event_message_cb != NULL)
+		mwdevice->mw_button_event_message_cb(mwdevice, btnevt[0], opts, mwdevice->mw_btnevmsg_data);
+
+	return 0;
+}
+
+void mw_set_button_event_message_cb(mwdevice_t *mwdevice, void (*mw_button_event_message_cb) (mwdevice_t *mwdevice, unsigned char buttons, unsigned char options, void *user_data), void *user_data)
+{
+	if (mw_button_event_message_cb != NULL)
+		mwdevice->mw_button_event_message_cb = mw_button_event_message_cb;
+	if (user_data != NULL)
+		mwdevice->mw_btnevmsg_data = user_data;
+}
+
+int mw_read_light_sensor_response(mwdevice_t *mwdevice, unsigned char *lightrsp, int len)
+{
+	unsigned short light_level = *(unsigned short *)(lightrsp);
+	unsigned short light_level_avg = *(unsigned short *)(lightrsp+2);
+
+#ifdef DEBUG
+	fprintf(stderr, "light sensor is at %d, average at %d\n", light_level, light_level_avg);
+#endif
+
+	if (mwdevice->mw_read_light_sensor_response_cb != NULL)
+		mwdevice->mw_read_light_sensor_response_cb(mwdevice, &light_level, &light_level_avg, mwdevice->mw_rlsrsp_data);
+
+	return 0;
+}
+
+void mw_set_read_light_sensor_response_cb(mwdevice_t *mwdevice, void (*mw_read_light_sensor_response_cb) (mwdevice_t *mwdevice, unsigned short *light_level, unsigned short *light_level_avg, void *user_data), void *user_data)
+{
+	if (mw_read_light_sensor_response_cb != NULL)
+		mwdevice->mw_read_light_sensor_response_cb = mw_read_light_sensor_response_cb;
+	if (user_data != NULL)
+		mwdevice->mw_rlsrsp_data = user_data;
+}
+
+int mw_status_change_event(mwdevice_t *mwdevice, unsigned char option, unsigned char *statrsp, int len)
+{
+	unsigned char mode = (option & 0x0f);
+	unsigned char status = statrsp[0];
+#ifdef DEBUG
+	fprintf(stderr, "Status change event for mode %s: %s\n", mw_screen_mode_names[mode], mw_status_string[status]);	
+#endif
+
+	// mwdevice->screen_mode = mode;
+	if (mwdevice->mw_status_change_event_cb != NULL)
+		mwdevice->mw_status_change_event_cb(mwdevice, &mode, &status, mwdevice->mw_stchev_data);
+
+	return 0;
+}
+
+void mw_set_status_change_event_cb(mwdevice_t *mwdevice, void (*mw_status_change_event_cb) (mwdevice_t *mwdevice, unsigned char *scrmode, unsigned char *status, void *user_data), void *user_data)
+{
+	if (mw_status_change_event_cb != NULL)
+		mwdevice->mw_status_change_event_cb = mw_status_change_event_cb;
+	if (user_data != NULL)
+		mwdevice->mw_stchev_data = user_data;
+}
+
+int mw_low_battery_warning_message(mwdevice_t *mwdevice)
+{
+#ifdef DEBUG
+	fprintf(stderr, "Watch battery low, please connect charger\n");
+#endif
+	if (mwdevice->mw_low_battery_warning_message_cb != NULL)
+		mwdevice->mw_low_battery_warning_message_cb(mwdevice, mwdevice->mw_lbatwarnmsg_data);
+
+	return 0;
+}
+
+void mw_set_low_battery_warning_message_cb(mwdevice_t *mwdevice, void (*mw_low_battery_warning_message_cb) (mwdevice_t *mwdevice, void *user_data), void *user_data)
+{
+	if (mw_low_battery_warning_message_cb != NULL)
+		mwdevice->mw_low_battery_warning_message_cb = mw_low_battery_warning_message_cb;
+	if (user_data != NULL)
+		mwdevice->mw_lbatwarnmsg_data = user_data;
+}
+
+int mw_low_battery_bt_off_message(mwdevice_t *mwdevice)
+{
+#ifdef DEBUG
+	fprintf(stderr, "Watch battery extremely low - radio will turn off\n");
+#endif
+	if (mwdevice->mw_low_battery_bt_off_message_cb != NULL)
+		mwdevice->mw_low_battery_bt_off_message_cb(mwdevice, mwdevice->mw_lbatbtoff_data);
+
+	return 0;
+}
+
+void mw_set_low_battery_bt_off_message_cb(mwdevice_t *mwdevice, void (*mw_low_battery_bt_off_message_cb) (mwdevice_t *mwdevice, void *user_data), void *user_data)
+{
+	if (mw_low_battery_bt_off_message_cb != NULL)
+		mwdevice->mw_low_battery_bt_off_message_cb = mw_low_battery_bt_off_message_cb;
+	if (user_data != NULL)
+		mwdevice->mw_lbatbtoff_data = user_data;
+}
+
+/* ----------------------------------------------------------------------
+ * Protocol handling
+ * ---------------------------------------------------------------------- */
+
+int mw_decode_frame(mwdevice_t *mwdevice, unsigned char *buf, int len)
+{
+	unsigned short crc;
+	unsigned char msglen;
+	unsigned char msgtype;
+	unsigned char msgopt;
+	unsigned char *msgdata;
+	unsigned char msgdatalen;
+
+	/* check frame */
+	crc = *(unsigned short *)(buf+len-2);
+	if (crc != crc16ccitt(buf, len-2)) {
+		fprintf(stderr, "decode frame CRC error\n");
+		return -1;
+	}
+	if (buf[0] != MW_SOF) {
+		fprintf(stderr, "decode frame SOF not found\n");
+		return -1;
+	}
+
+	msglen = buf[1];
+	msgtype = buf[2];
+	msgopt = buf[3];
+	msgdata = (buf+4);
+	msgdatalen = msglen - 4 - 2;
+
+	switch (msgtype) {
+		case MW_GET_DEVICE_TYPE_RSP:
+			mw_get_device_type_response(mwdevice, msgdata[0]);
+			break;
+		case MW_GET_INFORMATION_STRING_RSP:
+			msgdata[len-2] = 0;
+			fprintf(stderr, "Got info string '%s'\n", msgdata);
+			break;
+		case MW_GET_REAL_TIME_CLOCK_RSP:
+			mw_get_real_time_clock_response(mwdevice, msgdata, msgdatalen);
+			break;
+		case MW_READ_BATTERY_VOLTAGE_RSP:
+			mw_get_battery_voltage_response(mwdevice, msgdata, msgdatalen);
+			break;
+		case MW_READ_LIGHT_SENSOR_RSP:
+			mw_read_light_sensor_response(mwdevice, msgdata, msgdatalen);
+			break;
+#if 0
+		case MW_READ_BUTTON_CONFIG_RSP:
+			mw_read_button_config_response(mwdevice, msgdata, msgdatalen);
+			break;
+#endif
+		case MW_BUTTON_EVENT_MESSAGE:
+			mw_button_event_message(mwdevice, msgdata, msgdatalen, msgopt);
+			break;
+		case MW_LOW_BATTERY_WARNING_MSG:
+			mw_low_battery_warning_message(mwdevice);
+			break;
+		case MW_LOW_BATTERY_BT_OFF_MSG:
+			mw_low_battery_bt_off_message(mwdevice);
+			break;
+		case MW_NVAL_OPERATION_RSP:
+			fprintf(stderr, "NVAL operation response - ");
+			switch (msgopt) {
+				case 0x00:
+					fprintf(stderr, "success\n");
+					break;
+				case 0x01:
+					fprintf(stderr, "failure!\n");
+					break;
+				case 0x09:
+					fprintf(stderr, "Item Not initialized (Identifier Not found\n");
+					break;
+				case 0x0a:
+					fprintf(stderr, "Operation failed\n");
+					break;
+				case 0x0c:
+					fprintf(stderr, "Bad Item length\n");
+					break;
+				default:
+					fprintf(stderr, "unknown status 0x%02x\n", msgopt);
+					break;
+			};
+			break;
+		case MW_STATUS_CHANGE_EVENT:
+			mw_status_change_event(mwdevice, msgopt, msgdata, msgdatalen);
+			break;
+		default:
+#ifdef DEBUG
+			fprintf(stderr, "Unkown msgtype 0x%02x\n", msgtype);
+#endif
+			break;
+	};
+
+	return msglen;
+}
+
+
+int mw_feed_msg_buffer(mwdevice_t *mwdevice, unsigned char *buf, int len)
+{
+	char msgbuf[64];
+	int tlen;
+
+	if (len <= 0)
+		return -1;
+
+	memcpy((mwdevice->pbuf+mwdevice->pbuf_len), buf, len);
+	mwdevice->pbuf_len += len;
+	
+	while (mwdevice->pbuf_len > 0) {
+		/* scan for MW_SOF */
+		while (mwdevice->pbuf[0] != MW_SOF) {
+			memmove(mwdevice->pbuf, (mwdevice->pbuf+1), --mwdevice->pbuf_len);
+		}
+		tlen = mwdevice->pbuf[1];
+		/* OK, there is an SOF but the message is too short */
+		if (tlen > mwdevice->pbuf_len) {
+			/* we have to wait for more data to come in */
+			break;
+		}
+		/* here we have a complete msg */
+		memcpy(msgbuf, mwdevice->pbuf, tlen);
+		mw_decode_frame(mwdevice, (unsigned char *)msgbuf, tlen);
+		memmove(mwdevice->pbuf, (mwdevice->pbuf+tlen), tlen);
+		mwdevice->pbuf_len -= tlen;
+	}
+	return 0;
+}
+
+
+/* ----------------------------------------------------------------------
+ * General code usage
+ * ---------------------------------------------------------------------- */
+
+int mw_init(mwdevice_t *mwdevice, int mw_fd)
+{
+	memset(mwdevice, 0, sizeof(mwdevice_t));
+	mwdevice->mw_fd = mw_fd;
+	memset(mwdevice->pbuf, 0, MW_PBUF_LEN);
+	mwdevice->pbuf_len = 0;
+
+	/* figure out which device we run with */
+	mw_send_frame(mwdevice, MW_GET_DEVICE_TYPE, 0, NULL, 0);
+
+	return 0;
+}
+
+/* ----------------------------------------------------------------------
+ * Convenience functions not strictly part of the protocol
+ * ---------------------------------------------------------------------- */
+
+int mw_get_resolution(mwdevice_t *mwdevice, unsigned int *width, unsigned int *height)
+{
+	if (width == NULL || height == NULL)
+		return -1;
+
+	switch (mwdevice->devtype) {
+		case MW_DEVICE_TYPE_RESERVED:
+			return -1;
+		case MW_DEVICE_TYPE_ANA_DIGI:
+		case MW_DEVICE_TYPE_DEVB_ANA_DIGI:
+			*width = 80;
+			*height = 16;
+			break;
+		case MW_DEVICE_TYPE_DIGITAL:
+		case MW_DEVICE_TYPE_DEVB_DIGI:
+			*width = 96;
+			*height = 96;
+			break;
+		default:
+			break;
+	};
+
+	return 0;
+}
+
+
+/* if flip=1 bits in each byte are inverted 7->1, 6->2, 5->3,...
+   if invert=1 each byte is inverted
+ */
+void bmap_buffer_flipinvert(unsigned char flip, unsigned char invert, unsigned char *buf, int len)
+{
+	int i;
+	unsigned char tmp;
+
+	while (len--) {
+		tmp = 0;
+		if (flip) {
+			for (i=0; i<8; i++)
+				tmp |= ((*buf & (1<<i)) >> i) << (7-i);
+			// fprintf(stderr, "0x%02x -> 0x%02x\n", *buf, tmp);
+		} else
+			tmp = *buf;
+		*buf = invert ? ~tmp : tmp;
+		buf++;
+	}
+}
+
+
+void mw_send_bitmap(mwdevice_t *mwdevice, unsigned char mode, int width, int height, int offset, unsigned char *bmapbuf, int buflen)
+{
+#ifdef DEBUG
+	unsigned int i, x;
+#endif
+	unsigned int y, rowlength;
+	unsigned char mw_buf[24];
+
+	rowlength = (((width-1) / 8) + 1);
+	if ((height + offset) > 96)
+		height = 96 - offset;
+
+#ifdef DEBUG
+	fprintf(stderr, "row length = %d bytes\n", rowlength);
+	fprintf(stderr, "bitmap resolution is %d x %d\n", width, height);
+	fprintf(stderr, "\n");
+	for (y=0; y<height; y++) {
+		for (x=0; x<rowlength; x++) {
+			for (i=0; i<8; i++)
+				fprintf(stderr, "%c", (bmapbuf[(y*rowlength)+x] & (1<<(7-i))) ? '.' : ' ');
+		}
+		fprintf(stderr, "\n");
+	}
+	fprintf(stderr, "\n");
+#endif
+
+	for (y=0; y<height; y+=2) {
+		memset(mw_buf, 0, 24);
+		memcpy(mw_buf, (bmapbuf+(y*rowlength)), (rowlength > 12) ? 12 : rowlength);
+		memcpy((mw_buf+12), (bmapbuf+((y+1)*rowlength)), (rowlength > 12) ? 12 : rowlength);
+		mw_write_buffer(mwdevice, mode, 0, offset+y, mw_buf, 24);
+	}
+}
+